An adult should drink at least 6 cups a day.
8 cups
Thirteen Year Olds Should drink About 7 Cups Of water xD
4 cups
At least 6
As much water as you want.
you have to drink 6.25 cups
Most people should drink at least 7 to 10 average sized glasses of water each day.
preferably none
Around 5 Liters
5-6 cups a day
That is 11.8 cups